Rock-drill.



No. 836.846. PATENTBD NOV. 27, 1906. W. c. WHIIGOMB.

ROCK DRILL.

APPLICATION FILED Nov. 2, 1905.

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ROCK-DRILL.

Specification of Letters Patent.

Patented Nov. 27, 1906.

pplicatinn filed November 2, 1905. Serial No 285.617.

To LZZ whom it may concern.-

Be it known that I, WILLIAM C. WHIT- ooMB,'a citizen of the United States, and a resident of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Rock-Drills, of which the following is a specification, and which are illustrated in the accompanying drawings, forming a part thereof.

The invention relates to rock-drills of that class which are usually mounted upon a supporting-column rigidly secured in position in the mine.

More speciiically, the invention relates to means for attaching :such a drill to the supporting-column, and has for its obj ect to improve the construction of devices of this kind, and particularly to increase their strength.

The invention consists in the mechanism to be hereinafter described and claimed, one form being illustrated in the accompanying drawings, in which- Figure 1 is a vertical section of a rock-drill embodying the invention, the plane of the section being indicated by the line 1 1 on Fig. 2. Fig. 2 is a plan view of the same, showing the supporting-column in horizontal section.

Fig. 3 is a sectional detail as viewed from the line 3 3 of Fig. 1, and Fig. 4 is a detailof the construction separated from other parts.

The form of drill illustrated in the drawings is one which is particularly intended for making vertical cuts in the side walls of mine-drifts and is termed a "shearingwmachine. It is so mounted upon a supportingcolumn as to be capable of movement in one plane only. The supporting-column 10 is of ordinary construction and will preferably be provided at either end with an engaging point or clamp, (not shown,) which may be firmly compressed against the iioor and roof of the mine by-longitudinally extending the column to rigidly secure the latter in a vertical position.

For attaching the drill to the column there is provided a bracket 11, which, as shown, takes the form of a sleeve divided into halves 12 and 13 and may be rmly clamped upon the column by means of bolts 14 15 passing through the apertured ears 16 17, formed upon each of the halves. A trunnion 18 is mounted upon the bracket 11, being preferably formed integral with one of the portions, as 13, of the sleeve and projecting at right angles to the column 10.

A drill-cradle 19 is provided for carrying the drill and has a hub 2O recessed to iit over the trunnion 18. It is otherwise of usual construction, being'provided with the longitudinalways 21, in which the drill 22 may be longitudinally reciprocated in the ordinary way. Preferably the hub 20 is rotatably seated on the trunnion 18 and is held to its seat by a bolt 23, which, as shown, extends entirely through the hub slightly at one side of its center7 Fig. 3, and rests in a groove 24, which in order that the hub may be turned to any position extends entirely about the trunnion 18. Preferably the bolt 23 is so disposed that the groove 24 may be cut near the outer end of the trunnion, where it will have the least eect upon the strength of this member.

For controlling the rotation of the drill a worm-wheel 25 is rigidly mounted on the hub 20 and meshes with a worm-shaft 26, journaled in suitable bearings 27, rising from the bracket 11. A hand-wheel 28 is provided for turning the worm-shaft, and in order that this may be in a conveniently-accessible position it is mounted upon a short shaft 29, journaled in a suitable bearing 30, formed on the side of the bracket 11, and extending at an angle to the worm-shaft 26, with which it is operatively connected by means of the gears 31 32. Preferably the bearings 27 and 30 are both formed upon the same portion of the bracket 11 as the part 13, so that the drill may be removed from the column 10 without disconnecting the driving mechanism.

In using the device the column 10 will be rigidly secured in position in the mine, as previously described, and the bracket 11 mounted thereon being preferably clamped in position at the required height by drawing up the bolts 14 15. The drill-cradle 19 may then be applied to the trunnion 18 and will be held to its seat by the insertion of the bolt 23. The drill may then be operated in the customary manner and can be turned back and forth in the plane in which it has been set for the purpose of making a long cut in the mine wall by rotating the operating hand-wheel 28. I

The invention provides improved means capable of being so constructed as to have great strength for operatively connecting the drill-cradle 19 with the bracket 11 and obviously might be applied equally as well to such a drill as is shown in my pending appli- IOO IIO

cation for LettersvPatent, Serial No. 257 ,169, filed April 24, 1905, in Which'provision is made for rotating the bracket upon the supporting-column- I claim as my inventionl. In a rock-drill, in combination, a supporting-column, a sleeve mounted on the column, a trunnion carried by the sleeve, a drill-cradle having a hub litting over the trunnion, a Worm-gear formed on the hub, and a Worm-shaft journaled on the sleeve and meshing with the Worm-gear.

2. In a rock-drill, in combination, a supporting-column, a sleeve mounted on the co1- umn, a trunnion formed integral with the sleeve and perpendicular thereto, a bearing formed on the sleeve adjacent the trunnion, a drill-cradle having a hub fitting over the trunnion, a Worm-gear formed on the hub, and aWorm-shaft journaled in the bearing on the sleeve and meshing with .the gear.

3. In a rock-drill, in combination, a supporting-column, a sleeve adapted to iit the column and being formed in halves, a bolt uniting the halves of the sleeve, a trunnion.

adjacent the trunnion, a drill-cradle having a hub iitting over the trunnion, a Worm-gear formed on the hub, and a Worm-shaft journaled in the bearing on the sleeve and meshing with the gear.

4Q. In a rock-drill, in combination, a supporting-column, a sleeve adapted to fit the column and being formed in halves,.a bolt uniting the halves of the sleeve, a trunnion formed integral with one half of the sleeve and perpendicular thereto, a bearing formed integral with the same half of the sleeve and adjacent .the trunnion, a second bearing formed on the same hahc of the sleeve and eX- tending at an angle vto the first-named bearing, a drill-cradle having a hub fitting over the trunnion, a Worm-gear formed on the hub, a 'Worm-shaft journaled in the iirstnamed bearing on the sleeve land meshing with the Worm-gear, and a crank-shaft journaled in the last-named bearing on the sleeve and operatively connected with the Worm-shaft.

WILLIAM C. WHITCOMB. 

